Wow, NOAA has a great educational tool – a large spherical display representing earth, using computers and projectors to animate the display.  It is called Science on a Sphere.

Here’s a list of locations that have this.

It looks like a schools could build one of these for themselves, though I’m not clear any have done it and not clear on copyright issues – they say this is not an open source project.   It appears the cost would be in the neighborhood of 5-10,000 for the hardware consisting of 4 projectors and 5? computers, but I think the main challenge for schools would be the room.   Many schools don’t have a “spare room” they could easily dedicate to this project and it appears it’s complicated enough that it would be difficult to put up and take down for each lesson.

But what a great concept!   A few years ago we visited the Delorme world HQ back east and they had a  scale model of earth that was 3 stories high and rotated.   But the NOAA Science on a Sphere is better because you could project data and topography and vary the lessons.

Of course as a cheap alternative teachers should (MUST!) get “Google Earth” to all the students they have.    Google earth is arguably the best cheap visualization tool ever to hit geography and if you have not seen it get it now – it’s free and fantastic.